Good + Superior to other races
is a contradiction in term of writing
1) Let's say that MC is human, they are good, and superior to other races. Now what kinda of plot is possible ? Not many and restrict far too much. Also as "drama" is the best spice for fantasy series unlike slowlife or wholesome-only, meaning it's even more less likely to appear.
Possibility of novel with the setting : MC appear in world in peace, BAM, suddenly evil big aliens or dimensional monsters attack and everyone band together.
2) Human nature. Now it's known reality is shit, full of bad people and not butterflies. It feels unrealistic to have "humans" being superior AND good to other races, because most series already shown that human beings a greedy species. Most nowadays readers know that humans, especially easterners (recently unlike years ago), is a race that can as bad as the devil or as good as angels but with evil people far more common.
Unlike years ago, where you can see lot of novels with poetic or positive mood, like "knight save the world and get the princess", kids of that time now grew up and experience(d) the cruel society and know that this kind of thing is unrealistic. Now it feel more real when seeing plots of novels : "knight save the world and executed by the country because of fear of his strength". Internet also helped expose lot of ugliness of the world. For example, jp did very horrible things during WW2 despite being currently a country with lot of etiquette where you can even find shops that don't even have cameras or a clerk where the buyer pay by themselves.
3) Like i said before, the cliche/routine is far too anchored in the mind of everyone, that "human beings are jack-all-trade with fast reproduction". Asking for humans being superior to other races, is like finding a series portraying elf with purple skin, or orc being gracious, or dwarf being a maritime race of explorers that like the ocean.
4) Now compared to era of masterpieces like Mushoku, Arifureta, To aru majutsu, God of martial arts, Tower of God, Tutorial is too hard, etc
now most authors try far less to be original and try to use mainstreams routines. Its because now most readers are zoomers. Getting 1m readers of kids (that dont care to abuse wallets of parents) compared to 100k of old readers that consume smartly, the choice is not hard for people.
Also, for east, movies it's far safer to create a popcorn copypaste movie that dont cost a lot compared to a costly one with ton of special effects but can flop as it's original. In the same vein, authors prefer going the safe route of what everyone is accustomed to, compared to being brave and creating a totally original new settings that have a high-chance of flopping as zoomers just want adrenaline and the routines they like.
1.5) Related to [1]. Authors won't be sure to control the plot they could imagine with the setting of "humans superiors and good". Also maybe there are series that indeed use this setting. But problem is that because of internet surge, the number of series done by everyone and amateurs jumped at a crazy rate AND low remuneration. I know some very great series that had high potential but dropped/axed because they didn't get popularity hence gave up, one top favorite was a hotel novel where the rooms could give effects or a lucky-charm system that reset daily with high comedy.
1.5.5) Do you know ? You crave this kind of unique setting but some veteran readers like me, crave some easier settings but despite that it's been years but we still didn't see them.
One the most popular : We wish to see a chinese MC using a deathnote or something similar.
There was some series that had MC using curses or unlucky book or livestream punishing evil or even livestream-punishing evil with cameo of death note, but never we could find a novel (not fanfic) where the MC get a death note.
Not even a problem of copyright, but just ...... them not even trying. There are pokemon novels, marvel novels, cyberpunk novels, spoiling bunch of movies, use settings of other novels, they don't fear copyrights problems but doing a MC using death note ? no.
Also authors prefer doing routines and anti-routines: jp doing isekai, chinese doing urban or xianxia or fantasy-western, KR towers or urban-portals.
ps : For me, i crave 2 particular things because i seen 2 uncomplete novels with the idea. A talking system that can foresee the future for MC and a lucky-based system (bc the novel about lucky charm was too fun). But despite this plot is not that hard to AT LEAST try, never i seen series with this plots. But of course i see some novels like "MC can contact his past self with letter or phone messages" (not title) or able to phone call his future or young self, or there was a famous webtoon with a gambler class MC.
But never, N.E.V.E.R there were authors trying to do plots focusing that hard. Despite the crazy potential on that. [Edit : Oh "Luckiest man" is a popular chinese webnovel masterpiece that had luck-system that used KR-portals idea. Proof of the high potential of "luck system".]
Maybe i should check "webnovel.com" but the quality there......and often they are axed/hiatus or weird flavor as it's done by westerners.